anyone else had this problem

in my my jimny if i post something it sends that topic to the top of the list but dose not show my post then if i go to post again it will show at the bottom mine and other peoples last 5 or 6 posts including the ones that have not shown up in the topic.i can post normaly on everthing else though.it has done this before but i cant remember the solution.and when it does work all the posts will go up but if i delete one of them post that have gone up then they all get deleted.i have used 2 different laptops and a ps3 with the same results.any help ta.